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Old 06-10-2024, 01:05 PM   #1
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Victron 100/30 Questions

Hello All,

Trying to figure out a few things on this charge controller as I move forward in my build.

Side notes, this is on a Grey Wolf 18rrbl, but nothing here is specific to that trailer. I have 10AWG wire from the rooftop to the controller and also from the controller to the battery.

Pic attached with all the specs.

Given the specs of this controller, PV power - 440W @ 12v or 880W @ 24v.


A. Is it possible to use 2 x 200W 24V panels in parallel along with 2 x 100W panels in series to make 600W?
-Would I exceed the maximum PV open circuit volts of the controller doing this? Its 100V
Specs for panels attached.

-Is there a way to wire it where I wouldn't exceed the capabilities of this controller or the 10Awg wire I have coming from the roof?

This would be feeding into a 12 volt battery, does that matter? Will any power be wasted?

If this won't work, I'll likely go with the 2 x 100W in series and then parallel the single 200w. I already have the controller and the 2 x 100W panels.
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Old 06-10-2024, 03:33 PM   #2
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Mixing panels isn't the best idea. The controller is limited to 440W input, so the 2 200W panels in series seems like the way to go. I like series for the MPPT action but if you have shading issues, go to parallel.
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Old 06-10-2024, 03:45 PM   #3
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There’s some math involved for you to see the most efficient way to do this.

https://solarpanelsvenue.com/mixing-solar-panels/

I’d use the Vmp voltages..

My guess is all three panels in parallel make the most power. Math won’t lie.

If the math doesn’t work, another SCC would be the only option.
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Old 06-10-2024, 04:07 PM   #4
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I would get a small MPPT controller for the other panels. Running 2 MPPT controllers is your most efficient option.
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Old 06-10-2024, 05:18 PM   #5
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the rating 400w @12v and 800w@24v is related to the BATTERY voltage

If you got a 12v battery you can have 400w of panels
If you have 24v battery it is 800w of panels

the limit is based on the 30amp output multiplied the charging volts
14.4v x 30x = 432w
24v x 30amps = 800

Once you know the MAX you are allowed on a controller you can pick what panels

Advanced users can overpanel ... on a small system with panels laying flat and you fuse the wires it's doable
so adding 600w could work ..... only if you live up North in Alaska etc
(sounds like a good movie)
------------------------------------------------------------------------------------
You got very limited roof spaces so you need to work out best layout
and BEST size of the panels to match the layout... stick to sizes that closely match

DO NOT mix 100w with 200w panels unless you know exactly what you doing

if you already got a controller but find the roof could use a better / bigger MPPT for the best layout .... Get the MPPT and use the smaller one for a couple of ground panels.
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Old 06-10-2024, 06:40 PM   #6
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Thanks All, Appreciate all the input! Being that I already have the controller and 2 x 100w 12v panels installed, it seems it would be best to add 2 x more 100 watt panels to achieve 400w. 600W on 12v would be too much for my controller.

I am thinking to wire them all in series to maximize power generation in shaded areas (camp grounds and national parks) where I'll spend most of my time. Any contradictions to 4 x 100w panels wired in series. I stay under the 100V limit of the SCC even when using open circuit voltage. Any notable issues before I proceed? I will be using matching panels from the same manufacter (rich solar).
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Old 06-10-2024, 06:47 PM   #7
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In extreme cold weather voltage is higher and could be too much.
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Old 06-10-2024, 06:53 PM   #8
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Quote:
Originally Posted by chrisski View Post
In extreme cold weather voltage is higher and could be too much.
Thanks, using the Vmp voltages, I'm only at 75% capacity of the SCC.

Should I run them in series parallel? two panels in each series, then that in parallel?


I'll never see lower than 30's temp wise. What do you mean by extreme? How much does it tend to increase when its that low?
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Old 06-10-2024, 06:58 PM   #9
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Please do the math but at freezing your pushing the limits.

Here is a how to
https://diysolarforum.com/resources/...mperature.219/
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Old 06-10-2024, 07:09 PM   #10
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Quote:
Originally Posted by chrisski View Post
Please do the math but at freezing your pushing the limits.

Here is a how to
https://diysolarforum.com/resources/...mperature.219/
Thanks for that, looks like I'd be just over voltage when below freezing, good call. I plan on running them in series parallel to keep voltage down a bit.
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Old 06-11-2024, 09:05 AM   #11
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Same thing happened with my Victron 100 volt MPPT. I ended up going 3s2p with the 100/50 model.
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Old 06-11-2024, 09:26 AM   #12
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Quote:
Originally Posted by Rocks2Sand View Post
Thanks All, Appreciate all the input! Being that I already have the controller and 2 x 100w 12v panels installed, it seems it would be best to add 2 x more 100 watt panels to achieve 400w. 600W on 12v would be too much for my controller.

I am thinking to wire them all in series to maximize power generation in shaded areas (camp grounds and national parks) where I'll spend most of my time. Any contradictions to 4 x 100w panels wired in series. I stay under the 100V limit of the SCC even when using open circuit voltage. Any notable issues before I proceed? I will be using matching panels from the same manufacter (rich solar).
I think you have this backwards. With panels in series if one panel is shaded it will limit the current from ALL the panels. Parallel is better for shaded conditions.
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Old 06-11-2024, 09:26 AM   #13
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If you really want things to work smoothly be prepared to scrap what you got and start fresh. at least keep your existing setup for a ground panel.

work out your MAX roof layout and the largest sized panels you can fit
MOST roofs work with the 200w panels in TETRIS mode

once you know the roofs capacity.. decide on a controller and a wiring plan

if your plan is to add stuff in stages that can be done... but you need the PLAN first and buy only stuff that meets it


why ... put a 100w panel when a 200w would fit in that place?
you only got a fixed number of spots for panels ... Use it wisely and do it ONCE.
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Old 06-15-2024, 09:07 AM   #14
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Quote:
Originally Posted by TacomaJoe View Post
Mixing panels isn't the best idea. The controller is limited to 440W input, so the 2 200W panels in series seems like the way to go. I like series for the MPPT action but if you have shading issues, go to parallel.
Not quite, as I understand it. The controller is limited to 100 volts max input period. Donít exceed that and it will be happy. You could have 90 volts, and a million amps, the controller wonít mind a bit. It is limited to 440 watts OUTPUT (not input), but it will limit that itself. This is the whole concept behind Ďover panelingí, where perhaps you are in a location without great sun.
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Old 06-15-2024, 09:11 AM   #15
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Quote:
Originally Posted by Rocks2Sand View Post
Thanks, using the Vmp voltages, I'm only at 75% capacity of the SCC.

Should I run them in series parallel? two panels in each series, then that in parallel?


I'll never see lower than 30's temp wise. What do you mean by extreme? How much does it tend to increase when its that low?
You need to use Voc voltages, as that is the voltage the internal components of the controllerís limits. Only takes a very small fraction of a second to let the magic smoke out, and t hat is the voltage the controller sees at the moment you switch the panels on.
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Old 06-16-2024, 09:08 AM   #16
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Victron, like most MPPT SCC makers, lists max voltage capacity. They also list maximum panel wattage. The maximum PV wattage recommendations, it appears, is based on likely amperage inputted in parallel, I.e., 400 watts of panels could produce up to 30 amps under specific conditions (440 listed for Victron 100/30).
Overvoltage input causes the most problems on a SCC.
In my case, in one of my charging paths, I use a Victron 75/15 with 400 watts in a 2S2P configuration. This results in my panels producing a little over 50 volts and 10amps when charging. Victron lists 220watts nominal PV power. The SCC does limit output charging amps to 15.
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